. >> reporter: counihan was involved with massachusetts' health insurance rollout in 2006. scott, he says that taught him people don't buy insurance like they do a book or a car. they typically look at the options an average of 18 times before making up their minds. >> pelley: don, thanks very much. today, the justice department dropped its challenge to the merger of american airlines and u.s. airways after the airlines agreed to give up some of their takeoff and landing slots at a number of major airports. that will allow low-cost carriers such as jetblue and southwest to expand. if a judge approves the merger, it will create the largest airline in the world. inspectors are finding hazards in a pipeline designed to stretch across america. experts have made their ruling on whether the new world trade center really is america's tallest tower. and what's wiping out the starfish in california? when the "cbs evening news" continues. >> >> pelley: we've found evidence of construction problems on the most controversial pipeline in a generation. the keystone x.l. is designed to br